"Euler-Poincaré Characteristic." I had noticed this pattern in shapes along the various dimensions when I was a kid but none of my math teachers knew what I wa

"Euler-Poincaré Characteristic." I had noticed this pattern in shapes along the various dimensions when I was a kid but none of my math teachers knew what I was talking about. Never asked about it when I went to college, but I'm glad that there is a name for it.